/* ==========================================================================
   Anthropic ($ANT) — design system adapted from aopgov.us
   Near-black institutional archive · silver metal accent · red CTA
   ========================================================================== */

:root {
  --bg:            #0F1215;
  --bg-elev:       #161A1F;
  --bg-elev-2:     #1E2329;
  --bg-inset:      #0A0C0F;
  --line:          rgba(210, 220, 230, 0.11);
  --line-strong:   rgba(210, 220, 230, 0.22);

  --glass:         rgba(20, 24, 29, 0.62);
  --glass-tint:    rgba(190, 205, 220, 0.030);
  --glass-blur:    blur(14px) saturate(120%);

  --fg:            #ECEFF2;
  --fg-muted:      #A3ACB6;
  --fg-dim:        #707A85;

  --accent:        #C8D0D8;
  --accent-2:      #F4F6F8;
  --accent-soft:   rgba(200, 208, 216, 0.12);
  --gold:          #C8D0D8;
  --accent-line:   rgba(200, 208, 216, 0.32);

  --ok:            #189B7B;
  --warn:          #C9942B;
  --danger:        #E0655E;

  --btn-fg:        #FFFFFF;
  --btn-bg:        #C8102E;
  --btn-alt-fg:    #0F1215;
  --btn-alt-bg:    #ECEFF2;
  --glow:          radial-gradient(60% 60% at 70% 30%, rgba(200, 208, 216, 0.10), transparent 70%);
  --grid-line:     rgba(210, 220, 230, 0.045);
  --shadow:        0 1px 2px rgba(0,0,0,.4), 0 8px 32px rgba(0,0,0,.5);

  --r-sm: 8px;  --r-md: 12px;  --r-lg: 16px;  --r-xl: 22px;
  --maxw: 1200px;
  --pad: 40px;
  --nav-h: 72px;

  --sans: "Geist", "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "Geist Mono", "SFMono-Regular", ui-monospace, "Menlo", monospace;

  --ease: cubic-bezier(.16,.84,.44,1);
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 96px; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; color: inherit; background: none; border: none; }
button { cursor: pointer; }

::selection { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--fg); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--pad); }

.section { position: relative; padding-block: 112px; border-top: 1px solid var(--line); }
.section--flush { border-top: 0; }
.section--tight { padding-block: 80px; }

.rule { height: 1px; background: var(--line); border: 0; }

h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.035em; line-height: 1.03; }

.display {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  letter-spacing: -0.042em;
  line-height: 0.98;
}
.h2 {
  font-size: clamp(1.9rem, 3.8vw, 3rem);
  letter-spacing: -0.038em;
  line-height: 1.02;
}
.h3 { font-size: clamp(1.2rem, 1.8vw, 1.45rem); letter-spacing: -0.028em; }

.accent {
  background: linear-gradient(96deg, var(--accent) 8%, var(--accent-2) 92%);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}

.lede {
  font-size: clamp(1rem, 1.2vw, 1.12rem);
  color: var(--fg-muted);
  line-height: 1.62;
  max-width: 58ch;
}

.eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--fg-dim);
  margin-bottom: 20px;
}
.eyebrow::before {
  content: ""; width: 26px; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
}

.mono { font-family: var(--mono); font-feature-settings: "tnum" 1; }
.dim { color: var(--fg-dim); }
.muted { color: var(--fg-muted); }

.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head .lede { margin-top: 18px; }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head--center .eyebrow { justify-content: center; }
.section-head--center .lede { margin-inline: auto; }

/* badges */
.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 7px 15px 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-elev) 80%, transparent);
  font-size: 13px; color: var(--fg-muted);
  backdrop-filter: blur(8px);
}
.badge .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--warn);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn) 22%, transparent);
}
.badge .dot.live {
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent);
}

/* buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  height: 46px; padding-inline: 22px;
  border-radius: 10px;
  font-size: 14.5px; font-weight: 500; letter-spacing: -0.01em;
  border: 1px solid transparent;
  transition: transform .18s var(--ease), background-color .2s, border-color .2s, opacity .2s;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn svg { width: 15px; height: 15px; flex: none; }

.btn--primary { background: var(--btn-bg); color: var(--btn-fg); font-weight: 600; }
.btn--primary:hover { opacity: .88; }
.btn--ghost {
  border-color: var(--line-strong); color: var(--fg);
  background: color-mix(in srgb, var(--bg-elev) 55%, transparent);
}
.btn--ghost:hover { border-color: var(--accent-line); background: var(--accent-soft); }
.btn--alt { background: var(--btn-alt-bg); color: var(--btn-alt-fg); font-weight: 600; }
.btn--alt:hover { opacity: .92; }
.btn--sm { height: 38px; padding-inline: 16px; font-size: 13.5px; border-radius: 9px; }
.btn.is-disabled,
.btn[aria-disabled="true"] {
  opacity: .45; cursor: not-allowed; pointer-events: none;
  transform: none !important;
}

/* cards / panels */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 28px 26px;
  box-shadow: var(--shadow);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.card:hover { border-color: var(--line-strong); }
.card__meta {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--fg-dim); margin-bottom: 14px;
}
.card h3 { margin-bottom: 12px; }
.card p { color: var(--fg-muted); font-size: 15px; line-height: 1.55; }

.panel {
  position: relative;
  background: var(--glass);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 28px;
  overflow: hidden;
}
.panel::before {
  content: ""; position: absolute; inset: 0;
  background: var(--glass-tint); pointer-events: none;
}
.panel__label {
  font-family: var(--mono); font-size: 11px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--fg-dim); margin-bottom: 14px;
  position: relative;
}

/* nav */
.nav {
  position: sticky; top: 0; z-index: 50;
  height: var(--nav-h);
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  transition: border-color .3s, background-color .3s;
}
.nav.is-stuck { border-bottom-color: var(--line); background: color-mix(in srgb, var(--bg) 88%, transparent); }
.nav__inner { height: 100%; display: flex; align-items: center; gap: 20px; min-width: 0; }
.brand {
  display: inline-flex; align-items: center; gap: 12px;
  font-weight: 600; letter-spacing: -0.02em; flex: none;
}
.brand img {
  width: 36px; height: 36px; border-radius: 9px;
  object-fit: cover; border: 1px solid var(--line);
  background: #f4f0e6;
}
.brand b { color: var(--accent-2); font-weight: 600; }
.nav__links {
  display: flex; align-items: center; gap: 4px;
  margin-left: auto; min-width: 0;
}
.nav__links a.quiet {
  padding: 8px 12px; border-radius: 8px;
  font-size: 14px; color: var(--fg-muted);
  transition: color .2s, background .2s;
}
.nav__links a.quiet:hover { color: var(--fg); background: var(--accent-soft); }
.nav__cta { display: flex; align-items: center; gap: 10px; flex: none; }
.nav-toggle {
  display: none; width: 40px; height: 40px; border-radius: 10px;
  border: 1px solid var(--line); align-items: center; justify-content: center;
  margin-left: auto;
}
.nav-toggle span {
  display: block; width: 16px; height: 1.5px; background: var(--fg);
  position: relative;
}
.nav-toggle span::before, .nav-toggle span::after {
  content: ""; position: absolute; left: 0; width: 16px; height: 1.5px; background: var(--fg);
}
.nav-toggle span::before { top: -5px; }
.nav-toggle span::after { top: 5px; }

/* hero */
.hero {
  position: relative;
  min-height: calc(100svh - var(--nav-h));
  display: flex; align-items: center;
  padding-block: 72px 88px;
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background: var(--bg);
}
.hero__bg img {
  width: 100%; height: 100%; object-fit: cover; opacity: .42;
}
.hero__scrim {
  position: absolute; inset: 0;
  background:
    linear-gradient(180deg, rgba(15,18,21,.55) 0%, rgba(15,18,21,.78) 48%, var(--bg) 100%),
    linear-gradient(90deg, rgba(15,18,21,.82) 0%, rgba(15,18,21,.35) 55%, rgba(15,18,21,.7) 100%);
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at 40% 40%, #000 20%, transparent 72%);
  pointer-events: none;
}
.hero__inner { position: relative; z-index: 1; width: 100%; }
.hero__kicker { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-bottom: 26px; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.hero .lede { margin-top: 20px; }

.ca-card {
  margin-top: 36px;
  max-width: 640px;
  background: color-mix(in srgb, var(--bg-elev) 78%, transparent);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow);
}
.ca-card__top {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  margin-bottom: 10px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--fg-dim);
}
.ca-row {
  display: flex; align-items: center; gap: 10px; min-width: 0;
}
.ca-row code {
  flex: 1; min-width: 0;
  font-family: var(--mono); font-size: 13.5px;
  color: var(--accent-2);
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  padding: 10px 12px;
  background: var(--bg-inset);
  border: 1px solid var(--line);
  border-radius: 9px;
}

.wordmark-strip {
  margin-top: 48px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  overflow: hidden;
  background: #f3efe6;
  max-width: 720px;
}
.wordmark-strip img {
  width: 100%; height: auto; display: block;
}

/* origin / filing */
.origin-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 36px;
  align-items: start;
}
.origin-copy .lede { margin-top: 16px; }
.origin-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.embed-frame {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  padding: 18px;
  min-height: 420px;
  box-shadow: var(--shadow);
}
.embed-frame .twitter-tweet,
.embed-frame iframe {
  margin: 0 auto !important;
}
.embed-fallback {
  display: none;
  padding: 24px;
  color: var(--fg-muted);
  font-size: 14.5px;
}
.metrics {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-top: 18px;
}
.metrics span {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .08em;
  color: var(--fg-dim);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 7px 12px;
  background: var(--bg-inset);
}

/* about cards */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.feature-media {
  margin-top: 36px;
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 18px;
}
.feature-media .shot {
  position: relative;
  border-radius: var(--r-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  min-height: 260px;
  background: var(--bg-elev);
}
.feature-media .shot img {
  width: 100%; height: 100%; object-fit: cover; min-height: 260px;
}
.feature-media .shot figcaption {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 16px 18px;
  background: linear-gradient(transparent, rgba(10,12,15,.88));
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--fg-muted);
}

/* snapshot */
.snap {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.snap__i {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  padding: 22px 20px;
}
.snap__i .k {
  font-family: var(--mono); font-size: 11px; letter-spacing: .18em;
  text-transform: uppercase; color: var(--fg-dim); margin-bottom: 10px;
}
.snap__i .v {
  font-size: 1.35rem; font-weight: 600; letter-spacing: -0.03em;
  word-break: break-word;
}
.snap__i .v.small { font-size: 1rem; font-family: var(--mono); color: var(--accent-2); }

/* FAQ */
.faq { border-top: 1px solid var(--line); max-width: 820px; }
.faq__i { border-bottom: 1px solid var(--line); }
.faq__q {
  display: flex; align-items: center; gap: 18px; width: 100%;
  padding: 22px 4px; text-align: left;
  font-size: 17px; font-weight: 500; letter-spacing: -0.02em;
}
.faq__q svg {
  width: 17px; height: 17px; color: var(--fg-dim);
  margin-left: auto; flex: none;
  transition: transform .25s var(--ease);
}
.faq__i.is-open .faq__q svg { transform: rotate(45deg); color: var(--accent-2); }
.faq__a { max-height: 0; overflow: hidden; transition: max-height .32s var(--ease); }
.faq__a p { padding: 0 4px 22px; color: var(--fg-muted); font-size: 15px; line-height: 1.6; max-width: 68ch; }

/* finale */
.finale {
  text-align: center;
  background:
    radial-gradient(50% 60% at 50% 0%, rgba(200,208,216,.08), transparent 70%),
    var(--bg);
}
.finale .hero__cta { justify-content: center; }

/* footer */
.footer {
  border-top: 1px solid var(--line);
  padding-block: 56px 36px;
  background: var(--bg-elev);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
}
.footer__about p {
  font-size: 13.5px; color: var(--fg-dim); margin-top: 14px;
  max-width: 42ch; line-height: 1.6;
}
.footer h4 {
  font-size: 12px; font-family: var(--mono); letter-spacing: .18em;
  text-transform: uppercase; color: var(--fg-dim); margin-bottom: 14px; font-weight: 500;
}
.footer ul { list-style: none; display: grid; gap: 10px; }
.footer a { color: var(--fg-muted); font-size: 14px; }
.footer a:hover { color: var(--fg); }
.footer__bottom {
  margin-top: 40px; padding-top: 22px; border-top: 1px solid var(--line);
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
  font-size: 12.5px; color: var(--fg-dim);
}
.disclaimer {
  margin-top: 18px;
  font-size: 12.5px; color: var(--fg-dim); line-height: 1.55;
  max-width: 72ch;
}

/* reveal */
.rv {
  opacity: 0; transform: translateY(14px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.rv.in { opacity: 1; transform: none; }

/* mobile */
@media (max-width: 960px) {
  :root { --pad: 22px; --nav-h: 64px; }
  .nav__links { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav.is-open .nav__links {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; left: 0; right: 0; top: var(--nav-h);
    background: color-mix(in srgb, var(--bg) 96%, transparent);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line);
    padding: 12px 22px 18px;
    gap: 2px;
  }
  .nav.is-open .nav__links a.quiet { padding: 12px 10px; }
  .origin-grid, .grid-3, .feature-media, .snap, .footer__grid {
    grid-template-columns: 1fr;
  }
  .snap { grid-template-columns: 1fr 1fr; }
  .section { padding-block: 80px; }
  .hero { min-height: auto; padding-block: 48px 64px; }
  .nav__cta .btn--ghost.x-link { display: none; }
}

@media (max-width: 560px) {
  .snap { grid-template-columns: 1fr; }
  .ca-row { flex-direction: column; align-items: stretch; }
  .display { font-size: clamp(2.2rem, 11vw, 3rem); }
}

.embed-frame iframe{width:100%;min-height:520px;border:0;border-radius:12px;background:#0a0c0f}